Blower



, Jan. 10, 1939. E. I; ANDERSON 2,143,100

BLOWER Filed April 19, 1957 #vvawran Eon/4R0 L. Auosksq/v Arron/vars The inner ends of Patented Jan. 10, 1939 ward L. Anderson, Grease lie, to American Blower Corporation,

a corp ration of Delaware Mir-.11., assignm- Detroit, Micln,

Application April 19,1937, Serial No. 137,678

12 Claims. (Cl. 230-114) mounted on the shaft My invention relates to fans and in particular to a meansof controlling a volume ofair andthe movement of the air through the fan in order to insure the maximum efllciency of the 'fan at varying volumes.

It is my object to regulate the quantity of the air, at the same time using a regulating means as a means of guiding the air, so the variation in quantity of air will not disturb the efliciency of the fan for'the volume being handled.

It is my particular object to provide a fan of the type having an axial entry and a radial peripheral'delivery of the air with a Venturi shaped passageway to the fan, with which is sociated a conical slidable inlet damper that reciprocates to and from and within the Venturi shaped conical inlet passageway. 1 v

It is my further object to provide in association therewith a plurality of arcuate axially disposed radially arranged guide vanes so as to guide the entering air between the sliding damper and the volute passageway through the passageway and to cause it to take a preliminary whirl when entering the fan.

' It is my further object to arrange these vanes so that they can be adjustably positioned within the rotor of the fan. v

Figure 1 one of the sides through and showing the end of the slidable The drive shaft is in section and the adjusting mechanism for the damper has been removed for the purpose of clarity. Figure 2 is a section of the line 2-2 looking in the direction of the arrows, on Figure 1.

' Figure 3 is a section of the line 3-4 looking in the directieii of the arrows, of Figure 2.

Figure 4 is a view similar to Figure 2 show- 40 ing the damper adjusting mechanism in its innei'most position.

Figure 5 is a detailed view showing the overlapping relationship between the Venturi shaped conical inlet casing and the fan shroud mounted 45 on each end of the fan blades. Referring to the drawing in casing having oppositely distributed inlet openings in which are mounted conical Venturi shaped passageways 2 within the side walls 3.

these inlet passageways are arcuate l, and are in spaced parallel relationship with the throat 5 within the fan shroud 6 mounted on the plates I. These plates are supported by the center plate 8, which 55 is, in turn, mountedon the hub 9. 'This hub is detail, I a volute the bearings l l.

the sam Each are connected by ions l5 actuated by the handle l6. dampers l2 axially disposed which carry a air. is

the space between the the damper l2.

the extent to which into the fan is e vanes air and introduced of the guid the entry guide vanes.

position herein as The eiiiciency large degree, an increased by as the volume vanes are introduced to the fan air that has had a marked preliminary whirl, so as no indicates plurality arcuate inlet air It, suitably supported by the outlet irom e of the inlet passageways 2 are provided s that are disk like, desigare mounted upon slidrive shaft Ill. The arms amper I! on the hub i3. They any suitable means to an ad-. l4 and the pin- These conical of radially arranged guide vanes l1 damper the rack ositions within the fan.

controlled in volume by inlet passageway 2 and The preliminary rotation of the the rotating air is determined by the H, which are known is maintained, to a d under some circumstances is to increase the efliciency of the fan by supplying air with a preliminary of the plate 1.

In this manner, by

the volume the air with the fan, the

imately the and the extent in area a preliminary whirl over a greater area simultaneously adjusting over which whirl is delivered to fan is enabled to operate at approxsame cause this provides for space ends of the would exist function in between ing the distribution, but of the incoming ing air with a prelimi the part fan blades,

ifled one by the other.

Itwillbe understood eiiiciency on t is facilitated by the overlapshaped passageway 2 and the in detail otherwise exist, and due to the on the outer end All or theseveral parts perform varying volumes.

in Figure 5, bereentry air through the s l and 5, thereby insurnot only of the reentry air air, particularly the incomnary whirl, over the entry it ordinarily would space -that would turbulent air that of the fan blades. and relatively combination with one another in a where as their operation is modthat I desire to comprehend within my invention such modifications as 8. In a fan," the combination of a fan casing may be clearly embraced within the claims and havinga-conical entry passageway for incoming scope of my invention. air with an inner Venturi-shaped throat, a fan Having thus fully described my invention, rotor axially disposed with respect to said entry what I claim as new and desire to secure.by passageway and adapted to introduce air into Letters Patent is: the interior of the rotor to deliver it peripherally,

1. In a .fan, the combination of a fan casing and a reciprocating conical damper with a pluhaving an air entry passageway, a fan rotor ax-' rality of longitudinally disposed guide vanes ially disposed with respect to said passageway adapted to be adiustably positioned with .the

10 d h n blades spaced radially from the axis damper within said entry passageway and said Of rota i n h a disk ke damper movable fan rotor to impart a preliminary whirl to the wa ly nd w ly with r spect to a d air, said entry guide vanes being arcuate in secl t D sas w y' n r th volum 01' air pass-i. tion 'ahd equi-distantiy and radially disposed with in; he e nd ent y sni vanes orespect to the axis of the rotor.

i M w said damper fl l d t extend into 7. In combination, a fan housing having opposeid eiiti'y passageway and within the fan blades sitely disposed conical entry passageways, a fan i givih? pi'eiimihei'y whirl t0 the entering rotor axially disposed therebetween; conical airpi'im' toeiitei'ing therein dampers adiustably positioned with respect to disposed with respect to Said passageway and movable with said dampers adapted to be and having bladesespaced radially from the fan positioned variably within said entry pas5age axis, a disk like damper movable inwardly ;and ways and within said {an t outwardly with respect to said inlet passageway 8. In combination, a fan casing, a fan rotor t0 the Voiiime of Passing there having a plurality'of arcuate peripheral blades through ehdreiitry i vanes esseeieted with with their shrouds having inner arcuate ends, a

said damper adapted to extend into said entry n al inlet passageway havingaVenturi-shaped passageway allied extensible within the 19-11 blades inner end arranged in spaced parallel relation-.

ior living a Preliminary Whirl to the entering air ship within the arcuate end of said shrouds to prior to entering the fan rotor, said damper beform a reentry 1 passageway and a disk like i118 conical in eeetimidamper for said passageway carrying a plurality 3. In a fan, the combination of a fan casing f longitudinally disposed guide vanes ada t d t having it vehtiii'i'eheped entry passageway be positioned at varying positions within said fan rotor axially disposed with respect to said inlet passageway rotor and reentry passageway. pessageweye die? iike P movable iiiwei'd 9. A new article of manufacture for use with and out-war Y with respect said iiiiet fans comprising a conicai inlet damper plate and "S t0 eohtiei the veiiiihe Passing a plurality of longitudinally disposed radially ditherethiohghi end ehti'y guide vanes es5ieted rected arcuate entry guide vanes, and means for with said damper adapted to telescopically exadjustably positioning said mechanism within the 40 d into said entry passageway and ten rotor air entry passageway of a fan for extension of giving Pieiimihery whiii to h entering. the entry guide vanes within the rotor of the fan. Prior to entering the fan Said damper 10.. A new article of manufacture for use with being conical in section with a portion of its wall f n comm-15mg a conic let damper and a parallel to a portion of the wall of the Venturiplurality of longitudinally disposed radially -dj- V Shaped entry M V, rected arcuate entry guide vanes, means for ad- In fan, t emhihetih e ten easing justably positioning the foregoing mechanisms "having a conical entry passageway for incoming within the nentry passageway for extension of with an inner vehtiii'isiiepei throat, ten the entry guide vanes within the rotor of a fan rotor with radially outwardly shaped bla and and beneath the fan biades thereof, and means i511? disposed with respect said entry for supporting said mechanism on the drive shaft sageway and adapted to introduce air into the r the {an 1 interior of the rotor to deliver it peripherally, and In a t gomblnfltlon of affa ca ing a ci c n conical damper with a plurality ha an air entry passageway, a fan rotor prot lonaitildinally disposeiinwarfly extending vid e i i wlth blades spaced radially from the axis guide vanes extensible telescopically within the f the fan and many (M t respect t himiee adapted t0 he "h said passageway, and a disk-like damper movtiohed with t within said entry able inwardly and outwardly with respect to said mom and said rotor to impart a prelimin inlet passageway having entry guide vanes asso- 5. In a fan, the combination of a fan casing n extend m the i blade rotor to l e entry m immune trol the volume of air passing therethrough.

with en vehtiu'i'shepei tiimeitr 12. A new article of manufacture for use with ralit of lo tudin guidevanes i adapted to adiustab ly mgned with the them! i shape utensible within the blades of said rotor to im- EDWARD L ANDERSON, 

